Shuttle-bobbin for sewing-machines.



H. A. BALLARD. I

SHUTTLE BOBBIN FOR SEWING MACHINES.

APPLICATION FILED DEC. 26. 1907.

1 1 1 7, 302, Patented Nov. 17, 1914.

45 thereof.

50 the bobbin case.

unirnn sra'rns PATENT onnion.

BARBIE ILIBALLARD, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE BOYLSTON ,MANUFACTURING;COMPA1\TY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF NEW JERSEY.

SHUTTLE-BOBBIN FOR SEWING-MACHINES.

.5 of Massachusetts, have invented certain new and useful Improvements 1n Shuttle-Bob bins for Sewing-Machines, of which the following is a specification.

This lnventlon has relation to sew ng machine shuttles, and more particularly to those which are used in bootand shoe-sewing machines.

The object of the invention is to obviate the necessity of passing the thread through the various holes and apertures with which the bobbin case has been provided, and toy save the time of the operator. The threading operation, as heretofore performed 1n commercial machines, has required a del1-.

cate manipulation of the thread, and has wasted the operators time which .should be profitably spent in stitching shoes.

-According to my invention I provide the bobbin case with a channel or guideway which is open from end to end, that is from the edge of the rim of the case to the tip of the delivery nose, so that the thread which is drawn from the bobbin may be laid therein with ease and despatch. To prevent the thread from leavingthe passageway, there extend across thelatter one or more guards located at convenient'points, these being so formed, however, that the thread may he slipped laterally pastthem. The passageway 13 more or less crooked, sinuous or angular to offer the desired resistance to the passage of the thread, the tension being increased by a tension spring which yieldingly engages the thread.

Referring to the accompanying drawing which illustrates one embodiment of the invention, Figure-1 represents a front elevation of a bobbin case embodying the invention. Fig. 2 represents a side elevation Fig. 3 represents a perspective View thereof. Fig. 4 illustrates in perspective a portion of the bobbin case with the thread being laid in the passageway or channel. Fig.5 represents a section through the line 8-8 of Fig. 7

I Specification of Letters Patent. 1 Pat e tgd NOV. Application filed December 26, 1907. Serial No. 408,035.

Fig. 6 represents a section I The bobbin case comprises a cup-like shell I having a frontwall 10,- a cylindrical side wall 11, and a centrally arranged stud or bearing 12. The reel or bobbin is of the usual constructionand has a hollow hub or spindle 13 with end flanges 14, said hub being loosely journaled on the stud or bearing 12. The flanges of the reel fit'rotatably,

within the case as shown in Fig. 5, the parts being held together by the usual means, when placedin the shuttle. 7

As previously stated, the case has an open channel or passageway for the thread. To this end, it will be observed that the cylindrical wall of the case has aslot 15, which extends from its rim tot-he front wall. 10," and this slot communicates with or merges into a slot or groove 16 in the face of the front wall. This slot or groove 16 extends inwardly and opens into an elongated depression or groove 17 in said front face, in which is. secured theleaf tension spring 18 by means of a screw 19. The end wall 20 of said groove or depression is curved and also beveled, .and the end of'the springis beveled, the end of the spring" and .the end wall 20 being separated by a narrow space. At an obtuse angle to the groove 16, a groove or slot 21 leads from the depression 17 toward the edge'of the front face of .thecase, to the entrance of the aperture which extends longitudinally through the deliverynose 23. Formed spirally partially around the delivery nose, is a slot 24, the bottom of which forms the aperture 22, so that the thread may be entered laterally into said aperture by laying it in said spiral slot. To insure against the thread leaving the'channel or passage, thus constituted by the aperture, grooves or slots thus described, there are one or more guards Which project across said channel. One of'such guards is shown at 25. It consists of a beveled finger formed at thejunction ofthe cylindrical wall-and front wall of the case, the metal being cut away under the end of said finger, as indicated at 26, so that the thread may be slipped sidewise under it, at the junction of the slot "15 and the'groove 16; The tension spring constitutes another thread-retaining guard, as do thewalls of the nose on the sides of the spiral slot 24.

From the foregoing description, it will be apparent that, after-a sufficient amount of thread has been drawn from the reel, the

latter may be inserted in the case, the thread being laid laterally in the slot 15. Then the operator slips the thread laterally under the finger 25, bends it around the corner 27, slips it under the end of the spring, and lays it in the groove 21, and through the spiral slot 24, into the aperture in the nose. By

pulling on the loose end of the thread, the thread is drawn taut through the passageway, and lies properly therein ithout danger of leaving it. he thread may be laid in the channel very quickly as will be seen from the foregoing description.

It will. be recignized that it does not matter what particular direction the passagewa across the face of the case may take, provided it leads the thread under the tension spring, and thence to the receiving end of the delivery nose, and affords resistance to the movement of the thread. As shown the groove is angular or crooked, but of course it might be partially curved, and in each event it would not pass in a straight line but would be caused to bear against one side wall of the channel.

Having thus explained the nature of my said invention and described a way of constructing and using the same, although without attempting to set forth all of the forms in which it may be made or all of the modes of its use, I declare that what I claim is 1. The combination with a bobbin, of a cup-like case having a delivery nose projecting beyond the periphery thereof, said case having a continuous recess for the pa sage of the thread from the interior of the case across the exterior thereof to and through the said nose, said recess being open from end to end to permit the lateral insertion of the thread, and a tension spring arranged upon the exterior of the case so as to lie across said passage and cooperate with a face thereof, whereby the thread is clamped between said spring and said face.

2. The combination with a bobbin, of a cup-like case having a grooved delivery nose projecting from the periphery thereof, a channel extending from one edge of the face of said case to the said nose, said passageway being open from end to end to permit the lateral insertion of the thread, a tension spring arranged transversely to said channel, and a rigid thread guard extending across said passageway to prevent accidental dislocation of the thread.

3. The combination with a bobbin, of a cup-like case having a delivery nose projecting from the periphery thereof, a slot in its cylindrical wall, and a channel extending from the said slot to the said nose, said channel being open from end to end to permit the lateral insertion of the thread and said nose having a spiral slot formed about it and communicating with said channel, and a tension spring for engaging the thread in the said channel.

t. The combination with a bobbin, of a cup-like case having a stud on which the bobbin is ournaled, and a delivery nose projecting from the periphery thereof, said case having an open passageway for the thread comprising a slot in the cylindrical wall of the case, a channel across the face of the case from edge to edge thereof, a slot in said delivery nose, so that the thread may be inserted laterally therein, and a tension spring arranged across said channel.

The combination with a bobbin, of a cup-like case having a stud on which the bobbin is journaled, and a delivery nose, said case having an open passageway for the thread comprising a slot in. the cylindrical wall of the case, a channel across the face of the case, and a slot in said delivery nose, so that the thread may be inserted laterally therein, said case also having a tension spring extending across said passageway, and a guard at the junction of the first mentioned slot and said groove for preventing the thread from leaving said passageway.

6. A. bobbin case having a front wall and a cylindrical side wall, a channel extending across said front wall from edge to edge thereof, a recess in said front wall intersecting said channel, and a leaf spring arranged in said recess and having its end separated from the end wall of said recess so that the thread may be laid laterally under said spring.

'5. A bobbin case having a front wall and a cylindrical side wall, a nose projecting from the periphery of said side wall, said case having a continuous recess in the face of the front wall and in the nose, and a tension spring engaging said thread in said recess.

In testimony whereof I have affixed my signature, in presence of two witnesses.

HARRIE A. BALLARD.

Witnesses M. B. MAY, A. L. FOLSOM- Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). C. 

